One potential problem I flagged for a transformationist reading (I called it, pending a better name) of Nietzschean value creation was Nietzsche's own contention that "[t]he noble type of man experiences itself as determining values...." (BGE 260) I read this remark [1] as suggesting that the noble type took nothing outside himself as being co-determinative.
Well, had I made the modest effort of recalling the five words that follow those quoted (not to mention just about any other sentence from the section), I would have realized there's no problem here: "[I]t [i.e., the noble type] does not need approval...." The point being that the noble type decides [2] on his own what is valuable, rather than aping received values. This is a recurring theme in Nietzsche's work, and obviously says nothing about whether he takes the objective world to constrain -- to play a part in "determining" -- values.
Thus am I vindicated by my own incompetence.
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NOTES
1. And read it to myself, unfortunately: Had I made this gloss explicit, I'm sure my friend Rob Sica would have corrected me in short order.
2. BTW, 'decide' is also a suitable translation of 'bestimmen', the word Kaufmann translates as 'determine'. (The original passage: "Die vornehme Art Mensch fühlt sich als werthbestimmend....")